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Finding the Fourth Proportional to 221.10, 305.20 and 142.44

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Solution

The fourth proportional to 221.10, 305.20 and 142.44 is: 196.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.10 : 305.20 = 142.44 : x
  2. Step 2: Convert to fraction form
    221.10/305.20 = 142.44/x
  3. Step 3: Cross multiply
    221.10x = 305.20 × 142.44
  4. Step 4: Simplify right side
    221.10x = 43,472.69
  5. Step 5: Solve for x
    x = 43,472.69/221.10
  6. Step 6: Final answer
    x = 196.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.